code: def test_get_bbox_score(self):
      postprocessor = DBPostprocessor()
      score_map = np.arange(0, 1, step=0.05).reshape(4, 5)
      poly_pts = np.array(((0, 0), (0, 1), (1, 1), (1, 0)))
      self.assertAlmostEqual(
          postprocessor._get_bbox_score(score_map, poly_pts), 0.15
      )
  
file_path: mmocr/tests/test_models/test_textdet/test_postprocessors/test_db_postprocessor.py
imports: import unittest
  import numpy
  import torch
  from mmengine.structures import InstanceData
  from parameterized import parameterized
  from mmocr.models.textdet.postprocessors import DBPostprocessor
  from mmocr.structures import TextDetDataSample
label_desc: Use image node_id 1 for calling the TestDBPostProcessor obj's underlying member method code with example usage: obj.test_get_bbox_score() without return types